Molding machine



Jan. 27, 1931. G, DAVIS 1,790,408

MOLDING MACHINE Filed Nov. l, 1929 W U24 Z4 j y g @L ywww @9,

Patented Jan. 27, 1931v LEWIS e. DAVIS; or Rooxronn, rLLINoIs OFFICE l MOLDING 4iirncrrrnil:

Application led November `fixed. The -iiask is normally positioned ,upon

the pattern bed abouttheV pattern and the space between the flask and :pattern iilled with sand. The excess of sandis scraped from the flask and much of it 'falls upon the pattern bed around thesides of the `flask.

'A boardA is'placedupon the topY ofthe flaskVV and fastened-in this position after whichthe pattern bed, flask, and board, are rotated throughA a half circle. depositing the flask with the board on its lower side upon a draw or receiving table. The pattern and pattern bed are then vibrated by automatic means whereby the pattern vis loosened from the mold of sand. The pattern bed and pattern are then rotated back to their first position leaving the flask and mold uponthe draw table. Y

on the floor or frame of the machine atthe fsides of the draw vtable. The draw tableis i provided on its under side with a hydraulic p piston whereby it maybe raised or lowered at eachV molding operation.` The 'sand thus deposited tends topile up aroundthe sidesY of the table, and soon reaches a point where it begins to run inand comein contact with 40 l the exposed portion of the piston. In order to obviate this diiliculty it has Y been customary in the past to provide acanvas or cloth which has been draped about the piston from a Vpoint beneath vthe table.y This,`

however, hasrnot been entirely satisfactory because of the fact that guide rods andother moving parts near the piston have 'a tendency- -to catch the canvas and tear it,runl nown to the operator, whereby sand `is again carried into the piston. Thefdisastrous effects of art `from the following description 1, 1929. "seriaiNoQ toene.Y i

sand reaching this piston are obvious. The piston, because of its hydraulic operation, is covered with" a coating of oil. The sand clings tov this 'oil and when the piston returns l into the jcylinderthesand is carried in between the cylinders and piston walls7 causing very rapid vwearing of theparts.V In'addition to Vthis rapid wearthe sand causes the piston and other parts to sticlrin their downward movement giving themtablean 'erratic jerky -movement Thisjerly movementccauses the delicate mold upon the table to .disintegrate thus dissipating thework of the operator.

"One of the principal objects of my invention is the provision ofimproved means for I'nreventing the access offsand to the piston and the moving" parts near the piston. rI have aimed to provide a more positive operatingmeans than the canvas of the prior art,

whereby no special care is required in the 'f which consists in a telescoping wall arranged v f to completelyenclose the piston and extend When the flask isplaced upon the draw` j 30 table the sand which was upon the receiving table, on the outside of theflask, is deposited l*from thedraw tableto the framebeneath the tableY .Y1 Y j Y Other objects `Vand attendant :advantages will become apparent to those lskilled in the and the accompanying drawings in which- Y Fgurell is a vertical section through the sandguard as applied'to'a conventional draw table and piston;

Fig. Qis an enlarged section'through one side vvof the Vguard showing theV manner in Y. which the'sections are connectedtogether;y Fig. 3 is a fragmentaryview of the interior of the guardshowing connecting members; and` Y lisfavertical section through one side "of-the guard showing it in its extended position/If v l .j v I The'guard as shown consists generally of three telescoping sections indicated by the c l .1 7 longer'life than the guards ofthcprior art ,numerals 57i 6,'"and 7 and a pluralityfof convnecting Amembers presently to be described; 1

Thilo i have shown the guard as consisting of three members it will be apparent that any suitable number of these members may be employed. 1n this instance the guard is shown as being rectangular in form but here again it will be apparent that any suitable shape may be given the members. The upper member 5 is adapted to be attached to the sides 8 of a draw table 9 by meansV of screws or bolts 10. The member 5 extends on all four sides of the rectangular table 9 Aand projects downward therefrom. In ordery that the section may move through accumulated sand with a minimum resistancethe lower edge thereof is beveled as shown at 11. Section 5 is made to closely fit against thev outer wall of section 6 which is positioned therewithin. Section 6 is also provided with a beveled lower edge 12 similar to the edge 11 of section 5, and is supported upon section 5 by means of bolts 13 which are securely fastened to thelatter through brackets 14 and nuts 15 and 16, threaded upon bolts 13 near their ends. vBrackets 17 attached to section 6 are provided with an opening through which bolts 13 are permitted to slide. Heads 18 `on the bolts 13 limit this sliding movement of the bolts 13 in the brackets 17. The brackets 17 are also lprovided with an opening through which bolts 19 are securely fastened to the brackets through nuts 20 and 21, the bolts 19 have siidable engagement with an opening in brackets 22 positioned upon the upper edge of the section 7. A head 23 on the lower end of the bolts 19 limits the upward movement of the'bolts 19 in the brackets 22. Any number of these connecting bolts may be employed but I have found it convenient to employ at least one set on each side of the guard. Section 7 is positioned on the inner side of section 6 and is of such size as to cause the inner walls of the sections 6 and 7 to fit closely against each other. The section 7 is iiXedly attached to the frame 24 of the molding machine through bolts or screws 25 passingthrough a. fiange 26 on the lower end of the section 7.

1n the operation of the device section 5 is adapted -to move closely over the outer surface of section 6 and section 6 to move closely over the outer surface of section 7 the amount of this movement being regulated by the length ofthe rods 13 and 19. If oil or other Fluid is admitted to the interior of the cylinder the piston 28 supporting the draw table 9 is'caused to move upwarda distance .regulated by a lstop attached to the piston.

This stop consists of a regulating collar 29 'attachable to thel piston 28 at any desired elevation. A rod30 moving through a flange 31 is positioned in the collar 29 through a nut 32 whereby the length of this rodidetermines the distancethroughwhichthe table 9 may more. Guide rods 33'are attachedto the bottom of theV table9 Vand serve to guide the collar 29. These guide rods are adapted to move downward through suitable oprming.C in the frame 24 as the table 9 mores toward its lower position. Y

The table is shown in Fig. 1 iu a partly elevated position the lower ends of the guide rods 33 having emerged from the openings in the frame 24. During the movement upward to this position the section 5 has moved upward from theposition shown in Fig. 2 to the position shown in Fig. 1, the rod 13 movthrough the brackets 17 to permit this. However, at this position the head 18 of the rod '13 has reached the bracket 17 stopping further relative movement between section 5 and section G. As the table continues to move upward from the position shown in Fig. 1 the head 18 will bear against the bracket 17 causing the section G to be moved over the surface of section 7, the sections eventually reaching the position shown in Fig. 4.

rThis movement of the sections will be reversed when the table is'caused to move downward, in which instance the sections will move over each other from the position shown in Fig. 4 to the position shown in Fig. 2. It will be seen that thepbeveled edges 11 and 12 of the two upper sections 5 and 6 will cause any sand which may lie against the surface of section 7 to be moved outward, away from the surface permitting the two sections to move downward. Sufficient power will be provided by the weight of the table 9 and attached parts to force these two sectionsdown against the resistance of the sand.

Obviously, by this arrangement no sand is permitted to enter within the enclosure formed by the guard `and consequently the sand will not be permitted to pile up against the piston 28 or the rod 30.` These parts will at all times be permitted toslide smoothly through their bearings unhampered by the presence of small particles of sand; without the constant attention of the operator. 1t will also be immaterial to what height the sand may rest against the outer walls of the guard since there is 'no point between the frame 24 and the table 9 at which sand may enter thereunder. guard is such as to be highly dura-ble and economical to manufacture.

Vhile I have thus described and illustrated a specific embodimentfof my invention 1 am aware that numerous alterations and changes may be made therein without departing from the spirit of my invention and 1 do not wish to be limited except as required by the prior art and the scope-of the appended claims in which- Y Y I claim:

Y 1. In a moldingmachine having a frame, a draw table, and 'a hydraulic piston therebetween for raising and-'lowering said table,

a sectional wall positioned betweensaid table The constructionof the Iliff and said frame adaptedl to enclose said piston to prevent the entrance of sand comprising, a plurality of overlapping sections, the outer section being movable with said piston and theV inner section being attached to the frame, a plurality of rods parallelly positioned with respect to said wall arrangedto conne said sections, each of said rods being lixedly Vaitached near the top oi one of said sections and sli'dably attached to the nent succeeding section whereby raising of said table lwill cause slidable movement of thefirst section over said succeeding section for a predeter mined distance and concordant `movement of said sections thereafter, said movement causing said sectional wall to unfold with the raising of said Ytable whereby the sand resting against said wall is prevented from reaching said piston. Y

2. ln'a molding machinehavinga frame, a draw table, and a hydraulic pistonv therebetween arranged to move into andout ot said frame for raising and lowering said table, a

.telescoping wallconneeting said frame and said table adapted to enclose the exposed por-A tion of said piston comprisingfa suspended wall section attached at itsupperedge to said table and having its lower edge tapered toward its inner edge, a lower wall section attached at its lower edge'tofsaid frame', at least one intermediate Vsection havingits lower edge tapered toward the inner side,

saidl lower and intermediate sections being arranged to closely tit within said suspended section in telescoping relation, and means for maintaining said sections in telescoping relation vincluding a plurality of rods positioned on the inner side of said wall and substantially parallel thereto, lconnecting saidsections in sliding engagement whereby successive sections are caused to be raised as said table Yis raised.

8. In a molding machine having a frame, a draw table, and a hydraulic piston therebetween for raising and lowering the latter,

portion of said piston comprising a lower V'nesting said members.

ner member thereoff being attached to said frame and the outer member being attached to said table, means attached to said outer member adapted to raise successive members as said table is raised whereby a continuous wall is provided at diierent elevations ot' the table, to prevent loose sand resting against said guard from reaching said piston. i

rln a molding machine having a draw table and a hydraulic piston therebeneath for raising and lowering the former, Va telescoping sand guard adapted to enclose the eX- posed portionV of said piston comprising an upper member iixedlyfconnected toand movable with said piston, a lower member xedly below said table, at least one intermediate member arranged .to be raised or lowered by said upper member, and means slidably con- 6. ln `a molding machine havinga draw table adapted, to receive a mold, a frame, and a hydraulic piston therebetween for raising and loweringsaid table, a sectional wall arranged to prevent sand falling fromv said table from contacting with said piston, comprising a vertical upper wall section attached at its upper end to move with said table and having its lower edge inwardly beveled, Aat least one intermediate section positioned within said upper section having its lower edge .inwardly beveled, a lower section posin tioned within said intermediate section and attached to said frame, said upper and intermediate sections being arranged to move ver# ticallyV in accordrwith said table with respect to said lower section and with respect to each otherjto provide a continuous wall venclosingY movement.V n y K In witness of the foregoing I ax my s1g- Y Y Lewis e. Davis.

y .nature a sand guard adapted to enclose thel exposed member tixedly attached to said frame be-Vl Y neathV said table, ran upper member ixedly .connected with said table and arranged to..

slide over said lower member, atleast one intermediate member positioned between said y lower and said upper member, said upper and said Vintermediate member being adapted to slide over said lower membery intelescoping engagement as said table moves up and down, and means for preventing said members from becoming separated fromv said engagement when the table moves up, said-members act-v to the ing to prevent the admission of sand moving parts enclosed therein. v u 4;. In a' molding machine havinga frame, a

draw table, anda hydraulic-piston therebe-Y tween for raising and lowering the former, a

telescoping'fV sand guard adapted toeiiclose 

